Telephone system calling stations identifier



Feb. 9, 1960 c.E. BROOKS ETAL 2,924,666 TELEPHONE SYSTEM CALLING STATIONS IDENTIFIER Filed Sept. 19, 1957 18 Sheets-Sheet 1 ATTORNEY TELEPHONE SYSTEM CALLING STATIONS IDENTIFIER Filed spt. 19. 1957 Feb. 9, 1960 c. E. BROOKS ET AL 18 sheets-sheet 2 ATTORNEY Feb. 9, 1960 2,924,666 TELEPHONE SYSTEM CALLING STATIONS IDENTIFIER Filed sept. 19. 1957 C. E. BROOKS ET AL 18 Sheets-Sheet 3 Feb. 9, 1960 c. BROOKS 121mm. .2,924,666

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ATTORNEY .,Feb. 9, 1960 c. E. BRoo|- s ETAL TELEPHONE SYSTEM CALLING STATIONS IDENTIFIER med sept. 1e, 1957 18 Sheets-Shea?I 11 EGB 53 c. E. Roo/(s MEMO A. E. JOEL, JR.

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Feb. 9, 1960 2,924,666

TELEPHONE SYSTEM CALLING STATIONS IDENTIFIER 1a sheets-sheet 12 Filed Sept. 19, 1957 Feb. 9, 1960 c. E. BROOKS ETAL 2,924,666

TELEPHONE sYsTEM CALLING STATIONS IDENTIFIER I 18 sheets-551mmA 1:5

Filed Sept. y19, 1957 Feb. 9, 1960 c. E. -BRooKs ET AL 2,924,666

TELEPHONE: sTsTEMbALLING sTATIoNs IDENTIFIER Feb. 9, 1960 c. E. BROOKS ET AL `2,924,666

TELEPHONE sYsTEM CALLING STATIONS. IDENTIFIER ATTORNEY Feb. 9, 1960 c. E. BRooKs ET AL 2,924,666

TELEPHONE SYSTEM CALLING STATIONS IDENTIFIER sheets-sheet 1s Filed Sept. 19. 1957 c. 5 moo/rs NVENTORSA E JOEL, JR.

Q @hx Feb; 9, 1960 c. E. BRooKs ET AL 2,924,666

' TELEPHONE sYsTEMcALLING STATIONS IDENTIFIER 18 Sheets-Sheet 17 C. E BROOKS ATTURNEV Feb. 9, 1960 c. E. BROOKS lErm. 2,924,666 TELEPHONE sysTEM CALLING STATIONS IDENTIFIER 18 Sheets-Sheet 18 lFiled Sept. 19. 1957 muNlm ATTORNE V United Sees Patent O 1,924,666 e n e TELEPHONE SYSTEM CALLING STATIONS e e IDENTIFIER u l i Chester E. Brooks, Montvale, and Amos EQ Joel, Jr.,

South Orange, NJ., assgnors to Bell Telephone Laboratories, Incorporated, ,New York', N.Y., a corporation 1`he present invention relates generally to telephone .switching systems and more particularly to means therein used to identify calling stations incident to the extension of connections from station lines.

4 The present inventionis particularly adapted for identifyingpurposes in a switching system of the type wherein a signal is applied to a line incident to the extension therefrom of aconnectiony and wherein a calling station on said line is` identified incident to the application to said line of the said signal. i

rvThe prior art includes systems using various means for effecting station or line identification incident to the application of such` a signal to a line. of the present invention is the improvement of such means. Improvement by virtue of the present invention. lies in increased speed and reliability of the identification process attributable to what is believed to be the use for such purposes of new techniques and new circuit and apparatus arrangements.

One feature of the present invention isra storage device wherein are stored identity data for each of a plurality of stations and from which pertinent data may be read-out on a` selective basis. .l Another feature is a scanner-detector `for scanning the lines one at a time in repeatedlcycles at a rapid r-ate` to ascertain which lines exhibit the significant signal and to control the selective read-out of data from; storage.

The main object f Another feature is selectively 'operable reading means for reading from storage the identity data pertaining` to particular stations. Y f i Another feature is a gating means controlledA bythe scanner-detector to operate the read-out arrangement se lectively and uniquely foreach different line exhibiting said signal. i t

The foregoing features are combined to embody the invention in a station identifier of novel configuration. In the exemplary embodiment magnetic-drum storage is used in conjunction with a` capacitive, line scanner and with including electronic gates are provided controlled by` said scanner-detector to permit the reading heads to read-eut from the drum the pertinent identity data only during the pertinent time interval.

ice

and control circuits'wherebyone of a plurality of drum storage devices, each of which serves a separate plurality of lines, may, through the agency of its Iassociated scannerdetector, seize and connect to a common identier to the exclusion of other drum-,scanner-dc'tector pairs such that the identifier action, while capable of servicing any line in the system, may limit its attentionto` one operation at a time. l

The latter two features enable an identifier according to the present invention to serve a relatively large plurality of possibleline-to-trunk connections rapidly and without interference. l i x A further feature of the invention is provision of outpulsing controls whereby the identified data may be `outpulsed over the connected trunk. Such information can be'used at a remote termination of the trunk, such as at a tandem accounting center, as part of the data necessary for billing of a calling customer. e I

'A particular feature of the invention is the provision of a single register in combination with a sequence or walking control circuit whereby identity data may be read from the drum a portion at a time in sequence through the agency of selectively operated connectors interposed -between the reading heads and the register. The registration of'a .preceding portion of data is arranged to control theoutpulsingmeans, whereupon the walking control advances to release the register and to set up a new selective connector operation to enable a new data portion registration under the control of the previously-mentioned gating means. .l

Another particular featureresdes in the arrangement whereby the data portions prerecorded von a are digits arrangedV in a two-out-of-ive code of binary digits and theregister is aranged to register each digit ,in a two-out-of-five code and a translator is` provided `interposed between the register and the outpulsing means whereby the two-out-of-five coded digits may be translated to decimal digits prior to outpulsing. Another specific feature, directly related to the latter, is the' provision of y,a plurality of selectively operable connectorsassociated with the aforementioned translator and which are operated by the walking control circuit in conjunction with connectors interposed between the reading heads and the register, whereby a particular digit may be repeatedly read froma portion of the drum on successive revolutions ,thereof and may be translated differently, according to a preestablished plan, each time it is read.

Other features and advantages of the present' invention will be apparent in the light of the following detailed description of the exemplary embodiment disclosed inthe drawings,briefy descriptions of which are set forth below.

BRIEF DESCRIPTIONS OF DRAWINGS Fig. l shows in block diagram form the principal functional features of the present invention as applied to a type of telephone system known to the prior art;

Fig. 2 shows, in block diagram form, amplification of the organization of the principal functional features of the presenti invention as applied to a telephone system comprising a plurality of subscribers lines, some ofwhich may be multiparty lines, served by a plurality of outgoing trunks to other oices some or allV of which may be tandem Another feature of lthe inventionis the provisionof connector circuits and interrelated control means whereby one of aplurality of trunks, over which a connection may be set up responsive to` a calling condition 4on a line, may

obtain access to van identifier to the'exclusion of other trunks and whereby, as an incident to such identifier seizure by a trunk, the trunk applies said signalto a control conductor of the connected line and `initiatesthe identifying action of the identifierf l The latter feature is combined with similar connector switching centers;

Fig. 3 shows, in block diagram form, the functional organization of a plurality of groups of subscribers lines, some of which may be multiparty lines, served by a plurality of outgoing trunks to other ofiices some or. all of whichrnay be tandem switching centers, a plurality of line identifiers each common to a group of subscribers lines, two alternatively usable identifier control circuits designated A and B, a trunk preference lockout circuit, and a trunk preference lockout transferV circuit;

Fig. 4, in semidiagrammatic form, shows a portion of the developed surface of a typical one of the magneticdrum translators, the reading heads cooperative therewith, the circuitry by means of which the prerecorded information in the kdrum may be read, a digit at a time, by the reader circuits, and the related control circuits;

v Fig. 5 shows a plurality of groups of'subscribers lines some of which may be multipartyv lines such as the illustrated example, a plurality of magnetic storage drums each common to a group of lines, andthe equipment in a local central oce for establishing a connection between one of said lines and one of a lnumber ofoutgoing trunks; i Y

Fig. 6 shows a plurality of line scanner-detector circuits each associated with its respective magnetic-drum scanner;l I l v Figs. 6-A and 6-B, when placed end toendwith Fig.

Fig. 11 shows two digit-reader circuits designated A and B, respectively;

Fig. l2 shows two digit-translator circuits designated A and B, respectively;

Fig. 13 shows two outpulsing relay circuits designated l through 6-G are not included unless specifically enumer- 6-A on the left, show, in graphical form for a bona iide l call, the time relationship between the scanning of a line segment of the magnetic-drum scanner, the detection, storage and reading of a first positive pulse in the mag neticdrum, the detection of a second positive pulse, and the switching operations occurring during the time in terval required for one revolution of the drum between the detection ofsaid iirst and said second positive pulses; Fig. 6-B also, in graphical form, shows the presence of a pulse which remains stored in the main channel of the drum after the termination of a call, andthe; detection of a second pulse indicating a second call by the same subscriber;

Fig. `6-C, shows, in graphical form for anon-bona tide call, the time relationship between thev scanning of a line segment of the magnetic-drum scanner, the detection, storage and' reading of a positive pulse, the non-recurrence of a positive pulse, and the switching operations occurring during and after `the time interval required for one revolution of the drum between the detection of said v positive pulse and its non-recurrence; "`Fi"g. 6,-D isa curve illustrative of thepwave form of the alternating'current voltage output from a typical one of the reading heads (operatively associated with one of the channels of the drum wherein are stored the line identification data) in response to the presence of an X signal in the drum channel cell passing under said reading head;

the voltage output from a typical one of the integrator tubes of the channel reader circuits in response to an X signal voltage to the input of said integrator tube;

Fig. 6-G is a curve illustrative of the wave form of the voltage output from a typical one of theintegrator tubes of the channel reader circuits in response toan O signal voltage to the input of saidintegrator tube;

Fig. 7 shows the circuitry at the local central oice of a plurality of outgoing trunks to other centralofces, and illustrates in detail one of said outgoing trunks, and indicates4 diagrammatically a ,telephone switching system of a known type in which the illustrated trunk is'terminated; d v

Fig. 8 shows a plurality of digit and party field connector circuits each associated with its respective magneticdrum;

Fig. 9 showsamultisection trunk preference lockout ated)l inclusive, s'houldfbef arranged for a complete disclosure of the invention as emboldiedl in an automatic telephone switching system.

In Figs. 10 to 15, inclusive, the like designated circuits, in combination, respectively-constitute two identi# fier-control circuits A and B.`

GENERAL DESCRIPTION SYSTEM OPERATION In order to facilitate the tracing of circuit operations, each functional feature or item of apparatus appearing in Figs. 1 to 15. is designated either by a numerical designation, or; by afunctional designation consisting primarily of letters, which is preceded by the number of the figure in which said item appears. Thus, a relay or other. item mentioned `in thetext may readily be found in the draw- ,f tion, as a preliminary matter the general functioning of the system as illustrated in Fig. l will be described. Next, the functional organization'of the features shown in Fig. 2 will be discussed. Then, in somewhat greater detail, the functional relationship of the features shown in Fig.

' willbe covered.

Then, thel purpose and operation of themagnetic drum translator and related circuitry diagrammatically shown in Fig. 4will be setv forth. Finally, a description will be l-provided concerning the detailed operations of the circuits incident to the placing of a call by a suhscriber, the extension of a path toa tandem office, and the transmission to said. tandem office-of the indicia characterizing the identity of said callingsubscriber, as disclosed in Figs. 5 to 15, inclusive.

Referring'to Fig; l, whenv acall is initiatedatstation lSTgljy the removalfof the receiver at that station, the station is connected in the well-knownmanner through the primary line link 1 2, secondary line link 1-3 and sender link 194, to a Vsubscribers senderI-S which oper- .Y ates-to transmitJ dial' tone to thecalling station. Upon receipt of dial tone, fthefsubscriber at'station 1-ST dials the office code andy nurrrber-of the station desired. This information is registeredA inthe-subscribers sender 1-5 which thenfoperatels, with; the `aid Loffa marker (not shown), to extend thel connection YYthrough the required number-of line-extending switchessuch as, for example, `the primary district Flink 1146,' second'arydistrict link 1-7, primary office link 14S vand secondary 'office link L9, over anoutgoing trunk 1-10 at 'the local office, to an incoming trunk 1-27l atfor instance, a tandem switching point.

circuit with one sectionfor each outgoing trunk, anda l trunk preference lockout transfer circuit; l p v Fig. l0 shows two digit-walking circuits designated' A and B, respectively; i i

At the tandem oiicea sender Vlink and controller 1-11 associates a tandem sender l1-,171v with the trunk 1-27. The called line informationregis'tered in the subscribers sender 1-5 7is thentransmitted to and registered in the tandem ,senderk 1-,12 by means of, revertivepulsing from the tandem sender` in4 the well-knownV manner. When the calledline information has been'transmitted to the tandem sender 1-12, the subscribers sender 1,-5 isdisconnected. The tandem sender 1;-12, with thelassistance of a marker (notshown), extendsthe connection through the tandem oui-ce linker-41.3-tothctenninatingwoice1-14'and 

